Malicious PDF — malware analysis report

Static analysis result for SHA-256 667a6be318f5de8d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 18:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6ecdc1e6a2e361c96867ec6cb6f92a3 SHA-1: 0fdbcbfe22d85ad44700f7e8b9c3437ab0fdfc2b SHA-256: 667a6be318f5de8db81a11eb31b4b58599475e11e2cd147d6edaf1908be8116d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to external content. The ML classifier strongly suggests malicious intent, and the presence of numerous external links aligns with techniques used for SEO manipulation or distributing further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=harga+hp+android+dibawah+4+juta PDF link annotation
    • http://dralituncer.net/userfiles/file/noxilabagibepojimoxugamor.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/lesufiwuwetukurogulimivu.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/45069460685.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/80529164044.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35178407090.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/79878463815.pdfIn PDF document text
    • http://cutskytools.com/d/files/jizenugenera.pdfIn PDF document text
    • https://htchninc.com/d/files/66116174215.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///88432681622.pdfIn PDF document text
    • https://siroyensao.com/upload/files/fabuzoronalib.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_D0E634D7C7558517.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/7014424802.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/tawudunowokewamajulegi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • https://nasikampung.info/contents/files/giwivojutikevile.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e38e9fc3c---45116520035.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/gazagenubufiwu.pdfIn PDF document text
    • http://foxadv.net/file/wekafurarimimedalinimo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/19375966211.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/tegobobitoxadak.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75088f4fd---65496193237.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e787b3e593da409628273e8a828178ce/321510780.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/naletuveveluvejewonol.pdfIn PDF document text
    • http://flexa.cz/docs/file/73391633683.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 17276 bytes
SHA-256: 9e6323f2512ebf4ba406cd1a10682834eab15cedb3d869cd4e0e9d04af559f92
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10852 bytes
SHA-256: 8c0eef890443ef5a050902e1f016031dd2a11a72d59136d93d2d56735a38c45d
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1